Urgent Help: DVD Burner Not Recognize and Burn DVD anymore: Urgent Help

I got the DD0201 and got it burning a lot of DVDs with complete success for the last five months. But three days ago, while erasing ( full erase ) a DVD+RW, I canceled the erasing of this DVD+RW and started a new erase (quick erase ). After this quick erase, this DD0201 will no longer read or write any DVD disks any more: it becomes estranged to DVD disks: it now becomes a complete CD_RW burner: it burns CDs and CD_RW OK, but becomes completely estranged to DVD just like any CD_RW Burner( without DVD functionality) would behave: the DVD functionalities just disappear from this DD0201.
I do not know anything about DVD Burner technology. Is there a different laser for the DVD disks and is there a different laser for the CD disks within one DVD Burner? If so, then my guess is, since the DVD functionalities disappear from the above DD0201, the DVD laser has been turn off or not functioning correctlly.
As additionaly note: there had not been any abuses to this DD0201: no physical abuse as well as no electrical mishandling abuse: the only thing that I can think of is the last cancel on the full erase of a DVD+RW disk and the start of a quick erase on the same disk.
Does anyone have any ideas as of what had gone wrong? Since no abuses been applied to this DD0201, could it be that this DD0201 gives up its DVD funciontality naturally? Are there any way to recover from this DVD functionality Death?
Urgent Help, Please help !